point of intersectionA point shared by two graphs, whether they cross, touch, or overlap there. Its coordinates, the numbers locating it, make both equations true at the same time.
You’ll leave with these skills
01Find the missing number that makes two lines parallelSet the slopes of the two lines equal so the lines run side by side and never cross.
02Find the missing number that leaves an equation with no solutionAn equation has no solution when its variable terms cancel and its remaining constant terms differ.
03Find the missing number that makes an equation true for every xGraph the left side minus the right side in Desmos and drag the slider until that horizontal line lies on the x-axis.
04Find the missing number that gives a quadratic one solution or noneMove the missing number to the other side, graph the parabola that’s left, and use the height of its vertex to find the missing number.
This lesson is part of the full library
207 lessons that teach every skill the SAT tests
71Math
40Reading
24Grammar
10 full-length practice tests to build test-day stamina and confidence
A Desmos simulator to solve math questions faster
A step-by-step guide to every practice test question
The Bluebook Simulator, so test day feels familiar
A drawing for every key term, so new ideas make sense at a glance
